1st Generation Specific (1979-1985) 1979-1985 Discussion including performance modifications and technical support sections

GSL-SE Runs Terrible

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Old Oct 14, 2013 | 09:08 AM
  #26  
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Yellow is wrong, somethings wrong with coil, wiring or something. Wether thats the problem or not it needs to be addressed.
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Old Oct 14, 2013 | 01:40 PM
  #27  
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I agree, it sounds like it's running on one rotor.
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Old Oct 14, 2013 | 06:22 PM
  #28  
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it does sound like its running on one rotor and i would think that but the compression pulses are excellent and the engine will clear up and run fine here and there
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Old Oct 23, 2013 | 05:07 PM
  #29  
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could it be the front igniter? This was out in mine and corrected poor running. I understand that if the rear igniter is out, the fuel pump will not run either? Fact check please...I'm a noob.
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Old Oct 23, 2013 | 05:20 PM
  #30  
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From: https://www2.mazda.com/en/100th/
Originally Posted by mazdaverx713b
it does sound like its running on one rotor and i would think that but the compression pulses are excellent and the engine will clear up and run fine here and there
i had one that had a bad injector connector.... you might try to get it idling and spray a little brake cleaner in the intake and see if it smooths out.
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Old Oct 23, 2013 | 08:36 PM
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Have you checked the Injector grommets and pentel caps for cracks?
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Old Oct 24, 2013 | 04:48 AM
  #32  
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i'll try spraying some starting fluid in it today while its running and see if it smooths out. i replaced the injectors with a known good pair and there was no change.
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Old Oct 24, 2013 | 01:29 PM
  #33  
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Methinks you should pull the intake mani and see if a mouse is lodged in one of the intake ports lol
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Old Nov 9, 2013 | 02:01 AM
  #34  
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Probably should have changed the filter and pump first. Since they're old, they probably should be changed out anyway. I had similar issues with my SE and once I changed the pump and filter it was good to go. The pump and filter are extremely easy to change on these cars too.
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Old Nov 17, 2013 | 04:01 PM
  #35  
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Get it fixed?

Saw the posts above and I also had an issue with the wiring harness and the Fuel Injector connector for one of the rotors. It was an intermittent problem where the car would randomly run very poorly, down on power, and all fuel stuff checked out.

When it was running poorly one of those times, I opened the hood and grabbed the Fuel Injector wiring harness where it leaves the front of the intake manifold area and fuel rail area, gave it a tug and the problem went away. Pushed and pulled it and could cause the engine to run well/poorly on demand. Went to AutoZone and they had Borg-Warner injector pigtails for $7 each, bought 2, spliced them into the existing harness and problem solved.

Might be worth it if you feel mice have been in the engine bay and working at something. They like insulation, apparently. Good luck,
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Old Nov 18, 2013 | 06:35 AM
  #36  
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Originally Posted by LongDuck

Might be worth it if you feel mice have been in the engine bay and working at something. They like insulation, apparently. Good luck,
They also like cruise control vac lines, washer bottle hoses, wiper motor wiring, headlight harness, purge valves, solenoid hoses.....
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Old Nov 18, 2013 | 06:44 AM
  #37  
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LongDuck, to be honest, I have been frustrated with the car and it has sat for the last month. I have the day off today and its worth a shot to mess with. I inspected the connectors when I replaced the fuel injectors but may have missed a break in the wire. I'll have a go at it and post the results this afternoon.
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Old Nov 18, 2013 | 11:36 PM
  #38  
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Good bet that a visual inspection won't do it; the next time it's acting up, grab the harness in several places and push/pull gently to see if you can make it stop. It's 100% certain when you find the right harness/connector, since you can the make the problem start/stop on command, which tells you what needs to be replaced.

The wiring on these cars is pretty simple by today's standards, and I'm sure you'll find it - given enough time. Good luck, man - and keep that -SE on the road!
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Old Nov 19, 2013 | 08:22 PM
  #39  
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Ive heard this before on the 82 GTU I had, It was a massive vacuums leak on the intake manifold, spray carb cleaner or starter fluid around the intake manifold and all of your vacuums lines to make sure that is or is not it... Wouldn't hurt to check the distributor gear timing eather. Good luck man
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Old Nov 29, 2013 | 06:57 PM
  #40  
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yea, i have to get some time early next week to work on the car i've been super busy with replacing an engine on a customer's 79 and i took in an 85 S model in Dover White that needs some attention. i NEED to make the time for the car.
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Old Dec 8, 2013 | 11:26 PM
  #41  
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My car was running like crap. I changed 1 of my ignition coils that had gone bad, the car started to run good and strong. Have looked into replacing those?
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Old Dec 15, 2013 | 12:22 PM
  #42  
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i did. i tested the resistance of both and they speced out perfectly. thank you for the suggestion
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Old Dec 15, 2013 | 01:18 PM
  #43  
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did you miss any grounds?
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Old Dec 30, 2013 | 08:41 AM
  #44  
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Not that I can think of. Its worth a shot to go back over each one and check them.
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Old Dec 30, 2013 | 11:06 AM
  #45  
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Still not sorted out? Why not pull the engine? install new gaskets, injector grommets, O rings, new fuel line, filters, fluids etc then drop it back in. With the engine out you can inspect for damage to wiring and vacuum lines easier.
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Old Dec 30, 2013 | 11:06 AM
  #46  
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my GSLSE was running on one rotor too. never resolved it since it also had a spun bearing. But it was on the rear rotor. Have you replaced the ECU?
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